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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement Of Other Comprehensive Income [Abstract]        
Net income $ 13,781 $ 6,686 $ 40,136 $ 20,415
Other comprehensive income (loss), net of tax        
Foreign currency translation (2) 7 (2) 13
Change in fair value of marketable securities (45) 26 (104) 189
Adjustment for net losses realized and included in net income       10
Total change in unrealized gains (losses) on marketable securities (45) 26 (104) 199
Other comprehensive income (loss) (47) 33 (106) 212
Comprehensive income $ 13,734 $ 6,719 $ 40,030 $ 20,627